Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
SWEETSER
As described in historical dictionaries
Patronymica Britannica (1860)
SWEETSER. SWEETSUR. A native of Switzerland was formerly called a Switzer ; especially one of the hired guards ; a mercenary soldier. The Switzers were generally fat men, and hence the distich quoted by Cotgrave : —